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Simplifying a + -1(2x + -1y) = 5x + y a + (2x * -1 + -1y * -1) = 5x + y a + (-2x + 1y) = 5x + y Solving a + -2x + 1y = 5x + y Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2x' to each side of the equation. a + -2x + 2x + 1y = 5x + 2x + y Combine like terms: -2x + 2x = 0 a + 0 + 1y = 5x + 2x + y a + 1y = 5x + 2x + y Combine like terms: 5x + 2x = 7x a + 1y = 7x + y Add '-1y' to each side of the equation. a + 1y + -1y = 7x + y + -1y Combine like terms: 1y + -1y = 0 a + 0 = 7x + y + -1y a = 7x + y + -1y Combine like terms: y + -1y = 0 a = 7x + 0 a = 7x Simplifying a = 7x
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